kairojya's video: 2009 Nissan GT-R Strange Noises

I've owned the car for 13 months and it has the original 09 transmission with LC2 (it's a late model 09). I had the bell housing TSB performed about a month ago @ 29k~ miles, and ever since then I've noticed a weird shuttering noise when letting off the throttle engine braking at low speeds. For instance when in heavy traffic and doing speeds too quickly for 1st gear but too slowly for 2nd gear (15~ mph) and on and off the throttle constantly. When the dealership replaced my noisy bell housing (I had slack in my driveshaft) they also replaced the main driveshaft because the u-joints were binding. Additionally they replaced one of my cats/downpipes because it was damaged during removal due to seized hardware. The car feels fine during normal/full acceleration and when coming to a complete stop. I put this video together so I could link to it from a GTR Life forum post.